9x^2-(2y+1)^2=(3x-2y-1)(3x+2y+1)
{k+2<0
{D<0
D=16-4*(k+2)*(-2)=16+8k+16=32+8k
{k<-2
{32+8k<0⇒ k<-4
О т в е т. (-∞;-4)
А) 1.9 в) -1.4 56764879780890679895967867
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8^7 + 4^11 = (2^3)^7 + (2^2)^11 = 2^21 + 2^22 = 2^21 + 2*2^21 = (2 + 4)^21 = 6<span>^21; 6/3
</span>5^7 + (5^2)^3 = 5^7 + 5^6 = (25 + 5)^6 = 30<span>^6; 30/30
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